mirror of
https://github.com/xiaoqidun/ofdgo.git
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77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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import (
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"github.com/tdewolff/canvas"
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)
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// renderCanvasPage 渲染特定页面内容
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// 入参: page 页面内容
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// 返回: *canvas.Canvas 画布实例, error 错误信息
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func (r *Renderer) renderCanvasPage(page *PageContent) (*canvas.Canvas, error) {
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box, err := r.GetPageBox(page)
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if err != nil {
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return nil, err
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}
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width, height := box.W, box.H
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c := canvas.New(width, height)
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ctx := canvas.NewContext(c)
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if err := r.renderCanvasPageToContext(ctx, page, !r.TransparentBackground); err != nil {
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return nil, err
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}
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return c, nil
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}
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// renderCanvasContext 渲染页面到默认解释器上下文
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// 入参: ctx 画布上下文, page 页面内容
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// 返回: error 错误信息
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func (r *Renderer) renderCanvasContext(ctx *canvas.Context, page *PageContent) error {
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renderer := *r
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renderer.decodeImages = true
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return renderer.renderCanvasPageToContext(ctx, page, !r.TransparentBackground)
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}
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// renderCanvasPageToContext 渲染页面到指定上下文
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// 入参: ctx 画布上下文, page 页面内容, drawBackground 是否绘制页面背景
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// 返回: error 错误信息
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func (r *Renderer) renderCanvasPageToContext(ctx *canvas.Context, page *PageContent, drawBackground bool) error {
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r.renderError = nil
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box, err := r.GetPageBox(page)
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if err != nil {
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return err
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}
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if r.OnPageText != nil {
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renderer := *r
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renderer.pageText = &PageText{}
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r = &renderer
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}
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pageH := box.H
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if drawBackground {
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ctx.SetFillColor(canvas.White)
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ctx.DrawPath(0, 0, canvas.Rectangle(box.W, box.H))
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}
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if err := r.WalkPage(page, &canvasPageVisitor{r, ctx, pageH}); err != nil {
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return err
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}
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if r.renderError != nil {
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return r.renderError
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}
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if r.OnPageText != nil {
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r.OnPageText(page, r.pageText)
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}
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return nil
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}
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